ARTICLE
ARTICLE
In mandarins and navel oranges, fruit quality is built long before harvest. Firmness, rind integrity, internal condition and storage performance are influenced by how effectively the tree manages water balance, nutrient movement and stress during fruit development.
As heat events, moisture variability and salinity pressure become more frequent, maintaining effective calcium nutrition has become increasingly difficult — yet more important than ever.
Calcium plays a critical role in cell wall strength and membrane stability, directly influencing fruit firmness and resistance to post-harvest breakdown. However, calcium uptake and movement within citrus trees depends heavily on water movement and healthy cellular function.
During periods of heat, drought or high transpiration demand, calcium mobility can become restricted, resulting in localised deficiencies in developing fruit even where soil or foliar calcium programs are being applied.
LALSTIM OSMO SP is a glycine betaine-based osmoprotectant designed to support plant resilience by maintaining osmotic balance, membrane integrity and metabolic activity during abiotic stress.
It is rapidly absorbed and translocated throughout the plant, helping maintain water and nutrient movement when environmental conditions would otherwise restrict uptake.
These effects are particularly important for calcium nutrition. By improving osmotic pressure management, LALSTIM OSMO SP supports the movement of water, calcium and trace elements across plant cell membranes.
When used alongside calcium fertilisers, it improves calcium uptake, translocation and utilisation within the plant, particularly during stressful growing conditions.
Glycine betaine plays a central role by stabilising plasma membranes and protecting cells from stress-related damage. This helps maintain calcium transport activity and improves calcium retention within plant tissues.
Improved water relations also support calcium movement through the transpiration stream, while stronger nutrient translocation helps deliver calcium more effectively to developing fruit.
In mandarins, where skin condition and firmness influence market acceptance, stronger cell walls and improved tissue integrity contribute to better resilience through harvest, packing and transport.
For navel oranges, maintaining internal structure and shelf life relies on consistent calcium supply throughout fruit growth and maturation, especially during periods of heat stress.
Importantly, LALSTIM OSMO SP does not replace calcium inputs. It is designed to complement foliar and soil-applied calcium programs by improving their effectiveness.
Repeated applications alongside calcium sprays during periods of rapid fruit growth, heat, drought or salinity stress help support calcium movement when it is most limited.
For citrus growers and agronomists focused on improving post-harvest outcomes, combining LALSTIM OSMO SP with calcium provides a practical, science-based approach to support stronger fruit quality and consistency.
As citrus fruit move into early development and sizing, calcium demand increases while movement into fruit becomes more restricted.
Rising temperatures and variable moisture conditions can further limit calcium delivery, particularly into lower-transpiring tissues such as fruit.
Applying LALSTIM OSMO SP with calcium now and continuing through key growth periods helps maintain water balance and nutrient flow during elevated stress.
Repeated applications aligned with calcium programs support a more consistent supply of calcium to developing mandarins and navel oranges.
 |
 |
 |
Tom joins NEM with more than a decade of experience in the agricultural sector. Growing up on a family farm in Western Australia, he has built a career spanning sales, customer support, and product delivery - bringing a practical, grower-focused perspective.
